Sparking plug.



PATENTED OCT. 30,1905. I J. G. KINGSBURY.

SPA RKING PLUG. APPLIOATION Him) Mu'a. 1905.

W Smvewioc fi'ngsbmzaai-tomwgd To a, whom it may concern:

UNITED STATES A E s: OFFICE.

'JERE'G. KINGSBURY, OF WEST ORANGE, NEW JERSEY.

SjPARKING PLUG.

- vide a device of this character which she be simple in constructionand yet durable, as.

well asone which will be less expensive to manufacture and which willeffectually proteet the electrodes or sparking points against in ury;andto these ends my invention consists n providing a sparking plug thecasing of which is ieniovablysecured tothe combustion chamber orcylinder of an engine,

which casing is adapted to contain and support the various elementsof'iny invention without the use of auxiliary sections.

My invention further consists in certain novel detailsof constructionand combinations of parts, such as will be more fully de-' scribedhereinafter and particularly pointed 'outin the claim. I I

In the accompanyingdrawings, Figure 1 is a longitudinal cross-sectionthrough my improved sparking plug. Fig. 2 is an end view .thereof, andFig. 3 is a detail perspective view of the cup-shaped member, orelectrode.

A indicates the casing, which consists of a hollow metallic memberexternally threaded at its inner end and at its opposite end providedwith a polygonal head to receive a wrench in placing and removing theplug. The bore of this casin is reduced at a point intermediate of'itsen s and is also provided with an internally-threaded portion 1, theonterend of the casing being provided with an inwardly-projecting flange5 for a purpose hereinafter set forth.-

' The' members of the sparking plug are in troduced into thecasing fromthe inner end. An insulating bushing or sleeve 3, having an extern alshoulder 4 formed thereon is inserted through the inner end of thecasing, the reduced portion '2 of the bore fitting snugly around theshoulders of the sleeve and the inwardly-prolecting flange 5 snuglyembracing the erip any of the sleeve,v,an asbestos'-' likeegiao ing 6being received within the bore of t e casing between the flange 5 andthe shoulder 4 of the sleeve, the packing being 'capableofwithstanding-ahigh degree of heat Specification of Letters Patent. Application filedMay 3,1905. seriaiiio. zsasos.

Patented Oct. 30, 1906.

and forming a gas-tight joint at that point. Seated ainst the oppositeor inner face of the ShOl IilGI 4 is a ring or washer 7, which may be ofwire and is retained in place by means of a cup-shaped member 8,provided internal threads in the bore of the'casing.

The sleeve 3 'is provided with the usual channel extendinglongitudinally therethrough, the inner end of which channel beagainst wich rests the head 10 of a 'bolt 11, the body portion of the boltpassing throughthe channel and extending some distance beond the outerend. of the sleeve. This bolt is threaded at its outer end to receive alocking-nut 12, and between the nut and the outer end of the sleeveareilocated a bindingnut 13, slightly recessed on its inner face, and apacking-washer 14, the latter received between the recessed face of-thebindiiig-iiut 13 and the outer end of the sleeve and operating to forman elastic connection between the sleeve and nuts. An electricconnection is secured between the lock-nut 12 and the binding-nut 13,which latter, in conjunction with the bolt 11, forin a binding-post.

The headed-end of the bolt-is provided with a sparking point 15 i i theform of .a wire, which passes through the enlarged portion of thechannel in the sleeve to a point beyond the inner end thereof andadjacent the cup-shaped member 8, the latter being- .apert'ured, as at16, in alinement with the channel in the sleeve. The inner end of thewire extends within the circumference of the aperture andis bent toapproach the periphprotected thereby against injury. ,The aperture 16 ofthe en -shaped electrode is of: less diameter than t e chamber or spacein closed by such member, to the end that therush of gases 'on' theoutstroke of the piston will pass :rapidly throu h the constrictedopening thus formed 'an keep the splarking points and the chamberinclosed by t shaped member clean by ridding their ofany- P es 91,30which" i y Melitta lthere'omg;

in enlar ed, as at 9, to form a shoulder cry-thereof, the cup-shapedmember constiwith exteriorly-formed threads engaging the 1 From theforegoing it will be observed that I have devised a simple, neat, anddurable device consisting of but few parts and one which can be readilyremoved and replaced, the various elements composing the plugbeingeasily accessible for cleaning, it necessary, and for thesubstitution of new parts for old or worn-out ones, as well as foradjustment. It will further be observed that in assembli-ng the parts inthe manner set forth there is absolutely no danger of their being blownout by the pressure within the cylinder. It is evident,- therefor', thatslight changes might be resorted to in the form and arrangement of theseveral parts described without departing from the spirit and scope ofmy invention, and hence I do not wish to limit myself to the preciseconstruction hereo in set forth.

Having thus fully disclosed my invention, what I claim as new, anddesire to seciire by Letters Patent, is-

mg snugly embraced by the flange'and having an annular external flangewithin the casing packing between the two flanges, a cup-shaped terminalhaving external threads and fitted to the internally-threaded part ofthe casing in cooperative engagement with, the flange of thenon-conducting bushing or sleeve to removably hold the latter in place,the other end of said terminal having a central 0 enin g of lessdiameter than the termil'ial am lying within the casing, there being anannular space between the terminal and the non-con d uctin g bushing orsleeve,-the inner end of the bore oithe bushing or sleeve beingenlarged, a conduetor extendin through the bore of the bushing or sleeveand provided with a head in the enlarged portion thereof, atermin alextending from the head outwardl y through the inner end of the bushingor sleeve and (.lef'lectcd into close roximity to the opening in thecup-shaped terminal, said conductor having a threadedportion projectingbeyond the outer end of the bushing or sleeve, and a nut fitted thereon.

Signed at (Vest Orange, in the county of Essex andState of New Jersey,this 25th day l of April, A. 1). 1905.,

JERE G. KINGSBUR-Y. Witnesses MARGARET A; Jncons, A. E. KINGSBURY.

